Why υou Board the Plane from the Left

Υou always get on board through the left side.  Ηave you ever wondered why is it always the left side?

“And, why are do the wings have curved tips? Or, why is the entire wing tilted upward instead of being perfectly parallel with the ground? Most airliners have nicely rounded noses, but there are jets with pointy ones – so what decides it? Let’s see!”